USER_SDMA

Hi,

I am changing Myrinet NIC firmware to copy a data from NIC memory to NIC 
memory, instead of using DMA.
Especially, I take a look into "gm_sdma.c" and "gm_user_dma.h".
In "gm_user_dma.h", there is a "USER_SDMA" macro.
As I understand, USER_SDMA is performing SDMA to bring a data from a 
main memory into a NIC memory.
Would you explain what USER_SDMA really does?

So, I just commented USER_SDMA macro, and then, copy some data from NIC 
memory to NIC memory.
It does not work.
Do you have any idea about what I missed?

Best,
--Gyu Sang


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